var menuToggle = document.querySelector('.header').querySelector('.menu_toggle');
var menu = document.querySelector('.header').querySelector('.menu');

menuToggle.addEventListener('click',function(){
	console.log('123');
	if(menu.getAttribute('data-hidden') == "true"){
		menu.setAttribute('data-hidden','false');
		menu.style.position = "relative";
		menu.style.maxHeight = "270px";
	} else {
		menu.setAttribute('data-hidden','true');  
		menu.style.position = "relative";
		menu.style.maxHeight = "0px";
	}
});